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Strange interlace lines??

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Gian-Reto Gredig
Strange interlace lines??
on Mar 28, 2012 at 4:10:51 pm

Hi guys.
I'm referring to the following post:
http://forums.creativecow.net/thread/8/1116330#1116330

There were no answers there to my specific question, so I dare to ask the question again in a new post. I hope that's fine. Thanks for the time you guys invest in answering our questions. It's very helpful.

I shoot with the Canon Legria HF S11. I shoot in 50i, with MXP: High Quality 24mbps, which seems to be 1920x1080.

I did import the files from my camera via log and transfer into fcp 7. I did choose in the settings: apple pro res 422.
Now, when I watch the files in the viewer (not 100%) they have these interlace lines.
When I watch the files in the viewer (100%) they still have the lines.
When I drag and drop the files into a sequence and let choose fcp the hopefully right codec itself, it chooses: 1920x1080, 24fps, apple pro res 422, field dominance: none. When I watch the sequence now in the canvas, it has still the lines, whether I watch it 100% or not.
When I change the sequence's setting to field dominance: uneven (is this the same as upper-first?, I'm translating from german fcp...), then the lines seem to disapear in the canvas, if I watch it not 100%. BUT they are still there, when I watch it 100%.

Here's a link to a still, I made in FCP: http://images.creativecow.net/u/180333/complete.jpg

Do you have any suggestions, apart of using a (deinterlace) filter?
Thank you very much.
Gian


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Shane Ross
Re: Strange interlace lines??
on Mar 28, 2012 at 4:43:06 pm

That is interlacing. You shot 50i..."i" means interlaced, and that is what you have. Your computer display doesn't show interlacing well...and often the Canvas and Viewer don't either. The only way to see this without the interlacing is to view it on a TV or broadcast monitor via a video IO device. That will display it properly.

If you intend this footage for display only on computers...then you need to de-interlace it. And avoid shooting interlaced in the future.

Shane
Little Frog Post
Read my blog, Little Frog in High Def


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Alan Okey
Re: Strange interlace lines??
on Mar 28, 2012 at 4:45:08 pm

There is nothing wrong with or strange about seeing interlacing if you shot 1080i50. If you were watching your video on a broadcast monitor instead of on the computer display, you would not see the interlacing. Computer monitors cannot properly display interlaced material, which is why you see lines.

I'm not sure why FCP is using 1080p24 for the sequence setting, because your sequence settings need to match the format you shot, which is 1920x1080i50. Change your sequence settings to ProRes 422 1920x1080 50i.

What is your final delivery medium? Web? DVD? If you are exporting for web, don't use FCP's deinterlacing filter. Just edit your video, render, export a Quicktime movie (uncheck self-contained) and open the exported Quicktime in Compressor.

When you compress your video for the web, you can use Compressor to create a deinterlaced 25p video file. Turn frame controls on in the motion tab of the inspector window. Change Resize to Best, Output Fields to Progressive, and Deinterlace to Better or Best. Compressor's deinterlacing is much better than FCP's deinterlacing filter.

If you are making a DVD, there is no need to deinterlace your video. It will look fine when played back on a standalone DVD player connected to a TV set, and most decent DVD playback applications on computers have built-in realtime deinterlacing algorithms.


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Rafael Amador
Re: Strange interlace lines??
on Mar 28, 2012 at 4:50:53 pm

Hi Gian,
The Legria records both i50 and p24.
But the MXP mode that you say you are using, (up to the legria specs; http://www.canon-europe.com/For_Home/Product_Finder/Camcorders/High_Definit...
is not i50, but "p24".
This is why you are getting Prores 1080p24 when you log&Transfer.
Probably the files are "psf" (Progressive Segmented Frame), so Progressive but packed as Interlaced.
You need to check the footage in the Browser as Progressive (NONE).
Drag a clip to a new sequence, and click YES to match the sequence to the footage.
You shouldn't have no interlacing nowhere.
rafael

http://www.nagavideo.com


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Rafael Amador
Re: Strange interlace lines??
on Mar 28, 2012 at 4:56:53 pm

[Rafael Amador] "But the MXP mode that you say you are using, (up to the legria specs; http://www.canon-europe.com/For_Home/Product_Finder/Camcorders/High_Definit.....
is not i50, but "p24"."

That's wrong.
The camera shoot "p25". So what I said about "psf' is correct.
Check the footage as "Field Order: NONE" and set the Frame rate; 25fps".
No idea why the Prores stuff shows as "p24".
rafael

http://www.nagavideo.com


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Anja Bimmel
Re: Strange interlace lines??
on Oct 8, 2012 at 6:30:46 pm

Hi I have the same problem but I can't find where to change the setting as described:
"Check the footage as "Field Order: NONE" and set the Frame rate; 25fps".

Do you perhaps have a screenshot, thanks for your help!

Regards Anja


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Gian-Reto Gredig
Re: Strange interlace lines??
on Mar 28, 2012 at 7:44:33 pm

Thanks very much for these very quick answers. very much appreciated. i will look into this and come back to you when i found a solution...
thanks a lot.
Gian


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Gian-Reto Gredig
Re: Strange interlace lines??
on Mar 28, 2012 at 9:56:34 pm

Ok. I'm back again.
I checked my settings. And I saw, that I made a mistake. When I drag and drop the logged and transfered files into a new fcp-sequence and click yes to match the sequence to the footage, fcp chooses: 1920x1080, 25fps, apple pro res 422, field dominance: none.
So, I have 25 frames/sec. These isn't an issue thus.

As I don't have the camera with me at the moment, because I rented it, when I shoot, I cannot check what exact setting i choose for shooting. Might it be, that the european version of the camera has other formats then the american? When I check the Specs on the european site though it says, that the camera shoots only (?) progressive, if I understand it right... http://de.canon.ch/For%5FHome/Product%5FFinder/Camcorders/High%5FDefinition...

But then it would make even less sense, when I have these interlaced lines, right? Why do I have these lines and not only the lines, but also a duplication of the image within the image (see my still), if it seems to be that I have progressive footage, at least after the import?

Thanks a lot again.
Gian


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Rafael Amador
Re: Strange interlace lines??
on Mar 29, 2012 at 2:14:13 am

[Gian-Reto Gredig] " Might it be, that the european version of the camera has other formats then the american?"
f course. The american (Vixia) makes p25 and i60 (130).

[Gian-Reto Gredig] "When I check the Specs on the european site though it says, that the camera shoots only (?) progressive, if I understand it right... http://de.canon.ch/For%5FHome/Product%5FFinder/Camcorders/High%5FDefinition....."
The Specs says that records "p25", but nowhere says that records ONLY p25.
Says that in "Cine mode" records p25.
Only progressive recording in that camera makes no sense.

Ovbiously there are two fields on your picture, so whatever the clips/FC say tray a de-interlacer.
rafael

http://www.nagavideo.com


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